package com.zyx.nettypro.nio;

import java.nio.ByteBuffer;

/**
 * @author zyx
 * @since 2021/9/19 15:27
 */
public class BufferReadOnly {
    public static void main(String[] args) {
        //创建一个buffer
        ByteBuffer buffer = ByteBuffer.allocate(64);

        for(int i = 0; i < 64; i++) {
            buffer.put((byte)i);
        }

        // 读取
        buffer.flip();

        // 得到一个只读的Buffer
        ByteBuffer readOnlyBuffer = buffer.asReadOnlyBuffer();
        System.out.println(readOnlyBuffer.getClass());

        // 读取
        while (readOnlyBuffer.hasRemaining()) {
            System.out.println(readOnlyBuffer.get());
        }

        // ReadOnlyBufferException
        readOnlyBuffer.put((byte)100);
    }
}
